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If you read the product description, it clearly states that "The USB-C VGA Multiport Adapter allows you to mirror your MacBook or MacBook Pro display to your VGA-enabled TV or display in up to 1080p HD." 1080p = 1920x1080.

There is no such thing as an "unsafe resolution". You will not be in any physical danger if the wrong resolution is selected, you simply need to click the correct one.